:root {
  --bg: #f7f5f1;
  --surface: #ffffff;
  --text: #252525;
  --muted: #74706a;
  --line: #ded9d1;
  --accent: #4c6f68;
  --accent-soft: #d9e4df;
  --banner: #d9d7ce;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 32px;
  width: 100%;
  padding: 24px clamp(20px, 5vw, 56px);
  background: rgba(247, 245, 241, 0.88);
  border-bottom: 1px solid rgba(222, 217, 209, 0.72);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
  font-weight: 600;
}

.brand--layered {
  position: absolute;
  top: 24px;
  left: clamp(20px, 5vw, 56px);
  padding: 12px 14px;
  background: rgba(247, 245, 241, 0.76);
  border: 1px solid rgba(222, 217, 209, 0.76);
  backdrop-filter: blur(16px);
}

.brand__cn {
  font-size: clamp(1.35rem, 2.2vw, 1.9rem);
  letter-spacing: 0;
}

.brand__en {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
  width: 100%;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.site-nav a,
.language-toggle,
.button-link {
  min-height: 40px;
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.94rem;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  padding: 8px 10px;
  color: var(--muted);
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--text);
}

.language-toggle {
  flex-shrink: 0;
  padding: 8px 12px;
  background: var(--surface);
  color: var(--text);
  border-color: var(--line);
  cursor: pointer;
}

.language-toggle:hover {
  border-color: var(--accent);
}

.home-banner {
  position: relative;
  height: 560px;
  margin: 0;
  background:
    linear-gradient(135deg, rgba(76, 111, 104, 0.22), rgba(255, 255, 255, 0.12)),
    var(--banner);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.home-banner__media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background:
    linear-gradient(135deg, rgba(76, 111, 104, 0.22), rgba(255, 255, 255, 0.12)),
    var(--banner);
  overflow: hidden;
}

/* Replace assets/home/banner.mp4 in index.html to update the homepage banner video. */
.home-banner__media::after {
  content: "";
  position: absolute;
  inset: 18px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  pointer-events: none;
  z-index: 1;
}

.home-banner__video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.banner-caption {
  position: absolute;
  left: clamp(24px, 5vw, 64px);
  bottom: clamp(28px, 5vw, 56px);
  max-width: 520px;
  color: rgba(37, 37, 37, 0.68);
  font-size: 0.92rem;
  text-transform: uppercase;
  z-index: 2;
}

.section,
.page-main {
  width: min(100% - 40px, var(--max-width));
  margin: 0 auto;
}

.section {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: clamp(28px, 7vw, 96px);
  padding: clamp(72px, 12vw, 140px) 0;
}

.section__label,
.eyebrow {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section h1,
.page-heading h1 {
  max-width: 820px;
  margin: 0 0 22px;
  font-size: clamp(2.1rem, 5vw, 4.4rem);
  line-height: 1.08;
  font-weight: 600;
}

.intro-text,
.page-heading p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.5vw, 1.16rem);
}

.page-main {
  min-height: 72vh;
  padding: clamp(72px, 10vw, 128px) 0;
}

.page-heading {
  margin-bottom: 44px;
}

.eyebrow {
  margin: 0 0 14px;
}

.project-list {
  display: grid;
  gap: 22px;
}

.project-card {
  display: grid;
  grid-template-columns: minmax(260px, 38%) minmax(0, 1fr);
  gap: clamp(22px, 4vw, 48px);
  align-items: center;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.project-card__media {
  width: 100%;
  aspect-ratio: 4 / 3;
  background:
    linear-gradient(135deg, rgba(76, 111, 104, 0.18), rgba(255, 255, 255, 0.35)),
    var(--accent-soft);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.project-card__image {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 6px;
}

/* Replace project placeholders later with real images:
   .project-card__media { background-image: url("assets/project-banner.jpg"); background-size: cover; background-position: center; } */
.project-card__content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  min-height: 230px;
  padding: clamp(4px, 1.5vw, 18px) 0;
}

.project-card h2 {
  margin: 0 0 12px;
  font-size: clamp(1.45rem, 2.2vw, 2rem);
}

.project-card p {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
}

.project-card__meta {
  margin-top: 14px;
  color: var(--accent);
  font-size: 0.84rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  margin-top: 28px;
  padding: 9px 14px;
  background: var(--text);
  color: var(--surface);
  border-color: var(--text);
}

.button-link:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.button-link--secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--line);
}

.button-link--secondary:hover {
  background: var(--accent-soft);
  color: var(--text);
  border-color: var(--accent);
}

.publication-list {
  display: grid;
  gap: 22px;
}

.publication-item {
  padding: clamp(22px, 4vw, 36px);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.publication-item__meta {
  margin-bottom: 10px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.publication-item h2 {
  max-width: 860px;
  margin: 0 0 10px;
  font-size: clamp(1.45rem, 2.4vw, 2.2rem);
  line-height: 1.18;
}

.publication-item__venue {
  margin: 0 0 26px;
  color: var(--muted);
}

.publication-item__abstract {
  max-width: 860px;
}

.publication-item__abstract h3 {
  margin: 0 0 8px;
  color: var(--text);
  font-size: 0.95rem;
}

.publication-item__abstract p {
  margin: 0;
  color: var(--muted);
}

.publication-item__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.resume-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.back-link {
  display: inline-flex;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: 0.94rem;
}

.back-link:hover {
  color: var(--text);
}

.project-detail {
  max-width: var(--max-width);
}

.project-banner {
  aspect-ratio: 16 / 7;
  margin-bottom: clamp(38px, 7vw, 72px);
  background:
    linear-gradient(135deg, rgba(76, 111, 104, 0.18), rgba(255, 255, 255, 0.34)),
    var(--banner);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.project-banner__image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Replace this placeholder with a real project banner later:
   .project-banner { background-image: url("assets/project-banner.jpg"); background-size: cover; background-position: center; } */
.project-hero {
  padding-bottom: clamp(48px, 8vw, 88px);
  border-bottom: 1px solid var(--line);
}

.project-hero h1 {
  max-width: 900px;
  margin: 0 0 34px;
  font-size: clamp(2.8rem, 7vw, 6rem);
  line-height: 1;
  font-weight: 600;
}

.project-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  max-width: 900px;
  margin: 0;
}

.project-meta--three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.project-meta div {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.project-meta dt {
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
}

.project-meta dd {
  margin: 0;
  font-size: 1.02rem;
}

.detail-section {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: clamp(28px, 6vw, 80px);
  padding: clamp(52px, 8vw, 88px) 0;
  border-bottom: 1px solid var(--line);
}

.detail-section__content {
  min-width: 0;
}

.detail-prose {
  max-width: 820px;
}

.detail-prose h2 {
  margin: 0 0 18px;
  font-size: clamp(1.45rem, 2.2vw, 2rem);
  line-height: 1.2;
  font-weight: 600;
}

.detail-prose p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: clamp(1rem, 1.4vw, 1.12rem);
}

.detail-prose p:last-child {
  margin-bottom: 0;
}

.detail-list {
  display: grid;
  gap: 10px;
  margin: 0 0 20px;
  padding-left: 1.2rem;
  color: var(--muted);
}

.text-link {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.gallery {
  display: grid;
  gap: 36px;
  margin-top: 32px;
}

.gallery-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
}

.gallery-item {
  display: grid;
  gap: 12px;
  margin: 0;
}

.gallery-item--full {
  grid-column: 1 / -1;
}

.gallery-row {
  display: grid;
  gap: 14px;
}

.gallery-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.gallery-placeholder {
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(135deg, rgba(76, 111, 104, 0.14), rgba(255, 255, 255, 0.38)),
    var(--accent-soft);
  border: 1px solid var(--line);
  border-radius: 6px;
}

/* Replace a gallery placeholder with an image later:
   <img class="gallery-image" src="assets/process-01.jpg" alt="Describe this artifact"> */
.gallery-image {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.gallery-image--full {
  aspect-ratio: auto;
}

.gallery-caption {
  min-height: 48px;
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.external-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.contact-list {
  display: grid;
  gap: 12px;
  max-width: 760px;
}

.contact-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.contact-list span {
  color: var(--muted);
}

.site-footer {
  width: min(100% - 40px, var(--max-width));
  margin: 0 auto;
  padding: 28px 0 44px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 760px) {
  .site-header {
    position: relative;
    flex-direction: column;
    gap: 18px;
    padding: 20px;
  }

  .brand--layered {
    position: relative;
    top: auto;
    left: auto;
    width: fit-content;
    margin-bottom: -92px;
  }

  .header-actions {
    align-items: flex-start;
    flex-direction: column-reverse;
    gap: 14px;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .site-nav a {
    padding: 8px 8px 8px 0;
  }

  .home-banner {
    height: 420px;
  }

  .section {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .project-card {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .project-card__content {
    min-height: auto;
    padding: 0;
  }

  .project-meta,
  .project-meta--three,
  .detail-section,
  .gallery-grid,
  .gallery-pair {
    grid-template-columns: 1fr;
  }

  .project-hero h1 {
    font-size: clamp(2.4rem, 14vw, 4rem);
  }

  .project-banner {
    aspect-ratio: 4 / 3;
  }

  .contact-list a {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }
}